JP3111587B2 - Sealed lead-acid battery - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed lead-acid battery, and more particularly, to a sheet for absorbing an electrolytic solution which is disposed between an inner lid and an upper lid.

[0002]

2. Description of the Related Art A conventional sealed lead-acid battery will be described with reference to FIG.

As shown in FIG. 2, a conventional sealed lead-acid battery has a battery case 1 having a plurality of cell chambers, an electrode plate group housed in each cell room, an inner cover 2 and an upper cover 3 which cover the battery case. It is composed of When the pressure of gas generated by charging / discharging from the electrode group housed in each cell chamber becomes higher than a predetermined value, a safety valve 4 for rapidly discharging gas to the outside of the battery is provided in the inner lid 2.
Is provided.

[0004] Here, a battery case 1 is provided on a flat portion of the surface of the inner lid 2.
A recess 5 for accommodating a valve and an exhaust pipe 6 are respectively formed facing the upper side of each cell chamber, and a safety valve 4 is mounted on an upper portion of each exhaust pipe 6.

When the valve is mounted, the safety valve 4 and the exhaust pipe 6
Between them, sealing oil such as polybutene is applied for stable operation of the safety valve and airtight maintenance.

A rib-like low wall is provided around the upper surface of the inner lid 2, and the upper lid 3 is fitted inside the wall to cover the safety valve portion. A small rib 7 is provided on the back surface of the upper lid 3 at the periphery thereof, and the rib 7 and the surface of the inner lid 2 are in contact with each other, and the contact portion is welded by ultrasonic waves.

However, in such a configuration, when the battery is overcharged, the sulfuric acid electrolyte leaked from the safety valve may leak between the inner lid and the upper lid and leak out of the battery.

Further, oil applied between the safety valve and the exhaust pipe sometimes oozes out of the battery through the space between the inner lid and the upper lid. In addition, since the upper lid with a small thickness is installed on the upper part of the inner lid, the upper lid may come off or float up from the inner lid until the inner lid and the upper lid are ultrasonically welded. Work was difficult. In order to solve such problems, the following two measures have been taken.

One of them is to absorb the electrolyte or sealing oil in order to prevent the electrolyte or sealing oil leaking from the safety valve from leaking out of the battery through the gap between the inner lid and the upper lid. A liquid absorbing sheet in the form of a rectangular cardboard that can be used is placed between the inner lid and the upper lid.

The other is to provide a plurality of convex portions on a part of the periphery of the back surface of the upper lid and to provide corresponding concave portions on the surface of the inner lid in order to fix the positions of the upper lid and the inner lid. The position is fixed by fitting these convex and concave portions.

[0011]

However, as described above, convex and concave portions are provided on the back surface of the upper lid and a part of each peripheral portion on the surface of the inner lid, and a liquid absorbing sheet is provided between the upper lid and the inner lid. In this method, it was necessary to provide both a concave portion for fixing the position of the upper cover in the peripheral portion of the inner cover and an ultrasonic welding portion for welding the inner cover and the upper cover. It was limited to the central part of the surface of the inner lid so as not to hinder the position and welding.

Accordingly, the area of the liquid absorbing sheet is smaller than the area of the surface of the inner lid, and when a large amount of the electrolyte leaks from the safety valve, the absorption of the electrolyte and the sealing oil by the liquid absorbing sheet is difficult. There was a limit, and the electrolyte that could not be absorbed sometimes leaked out of the battery.

The present invention has been made to solve such a problem. When a battery is used, the electrolyte does not leak out of the battery even when a large amount of the electrolyte is discharged from the safety valve. An object of the present invention is to provide a sealed lead-acid battery provided with a liquid absorbing sheet capable of sufficiently absorbing and fixing a sealing oil between an inner lid and an upper lid.

[0014]

In order to achieve the above object, the present invention provides a battery case having a plurality of cell chambers, an electrode group housed in each cell chamber of the battery case, and the cell chambers. An inner lid provided with a safety valve facing above the upper lid, an upper lid covering the inner lid,
It consists of a liquid absorbing sheet placed between the inner lid and the upper lid, and a plurality of convex or concave portions are provided on the back surface of the upper lid, and corresponding concave or convex portions are provided on the surface of the inner lid. A sealed lead-acid battery in which the upper lid and the inner lid are positioned by fitting these convex and concave parts and both lids are welded, wherein the inner lid has a plurality of small protrusions on a plane portion of the surface thereof, and The liquid absorption sheet is provided with small projection through holes at positions corresponding to the small projections, and the small projections of the inner lid and the back surface of the upper lid are ultrasonically welded through the small projection through holes. It was done.

[0015]

In the inner lid of the present invention, the upper flat part of the surface is melted.
A plurality of small projections are provided for wearing. In addition,
On the part of the lid, the back of the upper lid to fix the position of this inner lid and the upper lid
Is provided with a concave portion corresponding to the convex portion provided in the first portion.

[0016]

Further, the sheet for liquid absorption, through holes are provided corresponding to the plurality of small impact force and a concave portion provided on the surface of the inner lid. Then, a small impact on the surface of the inner lid on the back surface of the upper lid cause
Li Bed is provided in corresponding to the position of the inner lid small impact force
This re blanking contacts through the small projections through hole sheet for the liquid-absorbent, the contact portion is welded by ultrasound.

As a result, the liquid absorbing sheet for absorbing the safety valve and the sealing oil can be installed widely and long over almost the entire area of the upper surface of the inner lid 2, thereby improving the liquid absorbing ability of the liquid absorbing sheet. be able to.

Therefore, even if a large amount of the electrolyte leaks from the safety valve at the time of overcharging or the like, the electrolyte can be completely absorbed by the sheet for absorbing the liquid, thereby preventing the electrolyte from leaking out of the battery. can do.

[0020]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a sealed lead-acid battery according to an embodiment of the present invention. In the sealed lead-acid battery of the present invention, the upper part of the battery case 1 provided with a plurality of cell chambers accommodating the electrode plates is covered with the inner lid 2. Here, a recess 5 for accommodating a valve and an exhaust pipe 6 corresponding to the upper part of each cell chamber are formed in a plane portion on the upper surface of the inner lid 2, and a safety valve 4 is provided above these exhaust pipes 6. Is installed.

A plurality of small projections 8 are provided on another flat surface of the upper surface of the inner lid 2, and pins provided on the back surface of the upper lid 3 for fixing the positions of the inner lid 2 and the upper lid 3. A concave portion 10 corresponding to the convex portion 9 is provided. A liquid absorbing sheet 11 having through holes 12 provided corresponding to the plurality of small projections 8 and the concave portions 10 provided on the inner lid 2 is provided on the upper surface of the inner lid.

The pin-shaped convex portion 9 of the upper lid 3 is
Into the recess 10 of the inner lid 2,
While fixing the inner lid 2 and the upper lid 3, the small projections 8 on the surface of the inner lid 2 were brought into contact with the ribs 7 on the back surface of the upper lid 3, and this contact portion was welded by ultrasonic waves. Accordingly, the liquid absorbing sheet 11 that absorbs the electrolyte leaked from the safety valve 4 can be disposed over almost the entire upper surface of the inner lid 2, and even if a large amount of the electrolyte leaks from the safety valve 4 during overcharge or the like. In addition, the liquid absorbing sheet was sucked out, and was not leaked out of the battery.

[0023]

As described above, the sealed lead-acid battery of the present invention has a plurality of small projections on the flat surface of the upper surface of the inner lid, and the small-sized protrusions on the sheet for absorbing electrolyte and sealing oil. Small projection through holes corresponding to the projections are respectively provided, and the small projections of the inner lid and the back surface of the upper lid are ultrasonically welded through the small projection through holes. It can be arranged over almost the entire upper surface of the inner lid without hindering welding, and a large amount of electrolyte and sealing oil leaked from the safety valve can be quickly absorbed without leaking out of the battery.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a sealed lead-acid battery of the present invention.

FIG. 2 is an exploded perspective view of a conventional sealed lead-acid battery.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 battery case 2 inner lid 3 upper lid 4 safety valve 5 hollow of inner lid 6 exhaust pipe 7 rib 8 small projection 9 convex part of upper lid 10 concave part of middle lid 11 liquid absorbing sheet 12 small projection through hole

Continuation of the front page (56) References JP-A 3-86559 (JP, U) JP-A 4-42049 (JP, U) JP-A 2-113260 (JP, U) Jiko 12-14756 (JP) , Y1) (58) Field surveyed (Int.Cl. ⁷ , DB name) H01M 2 / 04,2 / 12 H01M 10 / 06,10 / 12

Claims (1)

(57) [Claims] A battery case having a plurality of cell chambers; an electrode group housed in each cell chamber of the battery case; an inner lid having a safety valve facing above each of the cell chambers; An upper lid for covering the lid, a liquid absorbing sheet provided between the inner lid and the upper lid, a plurality of projections or recesses provided on the back surface of the upper lid, and the corresponding depressions or projections are provided on the inner lid. A sealed lead-acid battery in which the upper lid and the inner lid are positioned by fitting these convex and concave portions and both lids are welded, wherein the inner lid has a plurality of small projections on a flat surface portion thereof. However, the liquid absorption sheet is provided with small projection through holes at positions corresponding to the small projections, respectively. The small projections of the middle lid and the back surface of the upper lid are formed through the small projection through holes. A sealed lead-acid battery with ultrasonic welding.